What you're describing sounds like it could be swollen lymph nodes; there are several in your head and swelling of lymph nodes is not at all uncommon. If you've seen your doctor and he doesn't think there is anything to worry about, there probably isn't. It's impossible to diagnose such a thing over the internet, particularly with so little information, and your doctor is your best bet for reliable information. However, if you're still worried, you can always get a second opinion.
These are often just fatty lumps or cysts. Often you may have a genetic predisposition to them. They can be removed in the surgery, and usually they get bigger over time so it is a good idea to get them removed.
So that the sample is even and fair. If you were testing lumps and smaller lumps, you would make the test unfair. This is because the lumps would have a higher density that that of the smaller lumps. source: Masters Degree 2:1 in Biology and Bachelors Degree 2:2 in Chemistry from Manchester and Chester University.
They grind large lumps of rock into smaller pieces.
See your doctor!
If you have lumps go to the doctor. There are many causes for these, but only a doctor can determine if there is a problem.
Get a vet
Any lumps should be seen by your doctor. Hopefully, it is not serious, but get it checked.
You really need to see a doctor. As a general rule, lumps that get bigger should be taken seriously.
All sorts of things can cause lumps. Bruises, insect bites among others. If you are worried you should see a doctor.
If you have concerns then you should contact your doctor.
Any lumps on your testicles should be taken to a doctor. See the link below.
Any changes in the breast should be seen by a doctor. This includes lumps, discharge from the nipples and pain. You should do a self-examination every month and if you notice any changes at all you should make an appointment with your doctor.
Large lumps of rock that orbit the sun could refer to planets, asteroids, meteors.